July 2014
Intermediate to advanced
214 pages
4h 47m
English
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Query optimization statistics
Query optimization statistics are only a form of dynamic metadata that contains statistical information about the distribution of values in one or more columns of a table or indexed view. Statistics describe index key values, are maintained for index columns, and are used by SQL Server when deciding on the most appropriate indexes to use when running queries. Statistics help estimate the cardinality, or number of rows, in the query result, and this usually helps the query optimizer make better decisions. For example, if there are only a dozen rows in a table, then there is no reason to go to the index to search. This is because it is always better to do a full table scan to find the required result set. However, if ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.